I think the description and test suite on this problem is slightly off. When I see 'union' I already assume that no duplicates are permitted and order is irrelevant.
Sort a list of complex numbers based on far they are from the origin.
CONVERT TAN TO SIN
find the roots of a quadratic equation
Simple equation: Annual salary
Remove the positive integers.
Sum of odd numbers in a matrix
interesting center of magic matrix
Alternately upper-lower case
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